San Carlos Accessory Dwelling

In the draft Housing Element, the City of San Carlos will promote the develocraftsman-exteriorpment of second dwelling units (SDU) to increase housing opportunities. Some of the incentives for secondary dwelling units include encouraging local agencies, districts and utility providers to reduce hookup or other fees to facilitate the development of second units.  The City also aims to modify some of the second unit development standards, such as eliminating the 400-foot distance standard currently required between secondary dwelling units.  Another progressive goal for the city is identifying possible sources of funding for secondary dwelling units and “research potential funding sources for remodels of existing homes to create an autonomous second unit within the existing structure”.   The city will also continue to promote the amnesty program to legalize existing unpermitted second units.

Here are a few of the current requirements related to second dwelling units in San Carlos, though we recommend you review the zoning ordinance for the most accurate definition, requirements, variances and exceptions:

  • Attached SDU may be 30% of the home’s square-feet in area up to a 1,200 square-foot maximum. Detached SDU is limited to 640 square-feet maximum.
  • A Detached SDU must have a minimum of five feet from all side and rear lot lines. Detached SDU may be located in the rear one half of the lot and have a second floor element only if located over a detached garage.
  • Maximum height is 15’ unless located over a garage, bringing the height limit to 28’.
  • A tandem parking space may also be used to meet the parking requirement for the second dwelling unit, providing such space will not encumber access to a required parking space for the primary single-unit dwelling

Second units are not allowed if there is another second dwelling unit within 400 feet measured from nearest edge of the lot line of each respective or proposed second dwelling unit. However, the homeowner can obtain a waiver for this restriction.  Two other waivers related to the SDU are for the 5’ setback requirement (only for SDUs created prior to January 1, 2003) and window and door openings.

Verify with the Planning Division to confirm your requirements in your zoning district. Learn more about transforming your home by learning about our process, or contact us today if you are interested in building your own second dwelling unit, carriage house or other home project.

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